successful win32 build, unran. untested. handing off to sperl

- hand wrote defines for a few standard math functions for non C99 compliant platforms
- added #ifdefs to handle glew includes
-  put some preprocessor macros and includes to project file


git-svn-id: https://projectm.svn.sourceforge.net/svnroot/projectm/trunk@467 6778bc44-b910-0410-a7a0-be141de4315d

src/projectM-engine/texture.cpp

@@ -7,8 +7,14 @@
 #include <iostream>
 #include <string>
 #include <map>
-#include <GL/gl.h>
 
+#ifdef LINUX
+#include <GL/gl.h>
+#endif
+
+#ifdef WIN32
+#include <glew.h>
+#endif
 
 // openGL extensions if not present, define them
 #ifndef GL_COMPRESSED_RGB_S3TC_DXT1_EXT